An American diplomat in London, Robert Thorn, faces the tragic loss of his newborn son. Desperate and unsure of how to cope with the situation, he agrees to a proposition from a priest at the hospital: to adopt an orphaned baby, who turns out to be a charming boy named Damien. Over time, Robert and his wife, Kathy, begin to notice unsettling details about their new son. From strange coincidences to chilling occurrences, the atmosphere around them grows increasingly macabre.
As Damien grows, odd and violent deaths surround their family and those close to them, leading Robert to question the true nature of the child. Meanwhile, a series of lurking figures and succubi seem to shadow the family, revealing secrets that have remained in the dark for far too long. Robert's growing paranoia intensifies when he learns of an ancient prophecy involving his adopted son, revealing that Damien may be the Antichrist.
Indeed, Robert's struggle between his love for his family and the dark threat that Damien represents becomes a race against time. Soon, he must decide how far he is willing to go to protect his wife and, above all, his own heart. Imbued with an unsettling atmosphere and unexpected twists, the story explores the thin line between love, loyalty, and terror.